The ultraviolet photoelectron spectra and electronic structure of gas-phase and condensed SnF2 and PbF2

Abstract

He(Iα) and He(IIα) photoelectron spectra of SnF₂ and PbF₂ in the gas phase and as condensed solids have been recorded and analysed. The assignments of the molecular spectra were based upon correlation with established assignments for the lighter Group 4 difluorides which are normally considered to be metastable species. A close similarity was noted between the gas-phase and solid-state spectra. In the spectra of gas-phase SnF₂ features were identified corresponding to the presence of Sn₂F₄. No polymeric species were identified in the spectrum of PbF₂. Valence d shell ionization was observed for all systems.